ios - UITableView Cell colour changes on scrolling query -

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in application taking question in nsmutablearray , displaying on tableview row. have taken 2 buttons under each question(tableview row button). pressing yes , no button , tablerow colour changes green, yellow respectively.

the problem after pressing button in particular row row turns green. after scrolling unwanted cells turning green/yellow.

could please check below code , suggest

- (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {  contentview.hidden = yes; if( tableview == mychklist) {      static nsuinteger const kquestlabeltag = 1;     static nsuinteger const kyesbuttontag = 2;     static nsuinteger const knobuttontag = 3;      uilabel *questlabel = nil;     uibutton *yesbutton;     uibutton *nobutton;      static nsstring *cellidentifier = @"cell";      uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:cellidentifier];       if (cell == nil)     {         cell = [[uitableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:cellidentifier];          cell.selectionstyle = uitableviewcellselectionstylenone;           //cell bg         //self.mychklist.backgroundcolor = [uicolor clearcolor];         if (ui_user_interface_idiom() == uiuserinterfaceidiompad)         {              questlabel = [[uilabel alloc] initwithframe:cgrectmake(5,5,768,0)];             //some logic code             [cell.contentview addsubview:questlabel];               nsstring *titlestring = [buildingquest objectatindex:indexpath.row] ;             cgsize titlesize = [titlestring sizewithfont:[uifont boldsystemfontofsize:18] constrainedtosize:cgsizemake(670, maxfloat) linebreakmode:nslinebreakbywordwrapping];              uibutton *yesbutton = [uibutton buttonwithtype:uibuttontypecustom];                            //some logic button code              [cell.contentview addsubview:yesbutton];              uibutton *nobutton = [uibutton buttonwithtype:uibuttontypecustom];             //some logic button code              [cell.contentview addsubview:nobutton];        }     else      {          questlabel = (uilabel *)[cell.contentview viewwithtag:kquestlabeltag];         yesbutton = (uibutton *)[cell.contentview viewwithtag:kyesbuttontag];        nobutton = (uibutton *)[cell.contentview viewwithtag:knobuttontag];       }       questlabel.text = [buildingquest objectatindex:indexpath.row];      questlabel.numberoflines = 0;      nsstring *titlestring = [buildingquest objectatindex:indexpath.row] ;     if (ui_user_interface_idiom() == uiuserinterfaceidiompad)     {         cgsize titlesize = [titlestring sizewithfont:[uifont boldsystemfontofsize:18] constrainedtosize:cgsizemake(670, maxfloat) linebreakmode:nslinebreakbywordwrapping];         cgrect rect = questlabel.frame;         rect.size.height = titlesize.height+10;         questlabel.frame = rect;          yesbutton.frame = cgrectmake(10,titlesize.height+15,60,30);         nobutton.frame  = cgrectmake(95,titlesize.height+15,60,30);      }   if([self getcheckedforindex:indexpath.row]==yes)     {         cell.backgroundcolor = [uicolor greencolor];         cam_button.hidden = no;      }     else     {         cell.accessorytype = uitableviewcellaccessorynone;     }       if([self getcheckedforyellow_index:indexpath.row]==yes)     {         cell.backgroundcolor = [uicolor yellowcolor];     }     else     {         cell.accessorytype = uitableviewcellaccessorynone;     }       return cell;      }  }      - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath   *)indexpath {  uitableviewcell *cell = [tableview cellforrowatindexpath:indexpath];   if([self getcheckedforindex:indexpath.row]==yes) {     cell.backgroundcolor = [uicolor greencolor];     cam_button.hidden = no;  } if([self getcheckedforyellow_index:indexpath.row]==yes) {     cell.backgroundcolor = [uicolor yellowcolor]; }    if ([self.arraycheckunchek containsobject:indexpath]) {     cell.backgroundcolor = [uicolor greencolor];     cam_button.hidden = no;  }      if ([arraycheckunchek2 containsobject:indexpath])     {         cell.backgroundcolor = [uicolor yellowcolor];     }   }     - (void)tableview: (uitableview*)tableview willdisplaycell: (uitableviewcell*)cell  forrowatindexpath: (nsindexpath*)indexpath  { uitableviewcell *cell = [mychklist cellforrowatindexpath:indexpath]; //same code didselectrowatindexpath method  }    -(void)noaction:(id)sender event: (id)event { _cellbuttonpress = yes; checkuncheck = yes; nsset *touches = [event alltouches]; uitouch *touch = [touches anyobject]; cgpoint currenttouchposition = [touch locationinview:self.mychklist]; nsindexpath *indexpath = [self.mychklist indexpathforrowatpoint: currenttouchposition];  uibutton *button = (uibutton *)sender; uitableviewcell *cell = (uitableviewcell *)button.superview.superview;  cell.backgroundcolor = [uicolor yellowcolor]; [self checkedcellatyellow_index:indexpath.row];  [arraycheckunchek2 addobject:indexpath]; }

you need set background color of newly allocated cells. if don't that, when cells had turned green reused, stay green.

    if (cell == nil) {         cell.backgroundcolor = [uicolor clearcolor];         ...

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